Insulation Coating of Fe–Si–Cr Soft Magnetic Powder by Selective Oxidation

Jae‑Young Park,Kwangsuk Park,Bosung Seo,Julien O. Fadonougbo,Tae‑Wook Na,Ki Beom Park,Hyeon‑Tae Im,Nong‑Moon Hwang,Hyung‑Ki Park 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7

This study examines the insulation coating technology of Fe–Si–Cr powder via selective oxidation annealing, which oxidizeselements selectively by controlling the oxidation potential. The study calculated the oxidation driving force of Fe, Si, andCr, and conducted a thermodynamic analysis of oxidation and reduction conditions according to temperature and oxidationpotential. Based on the results, a selective oxidation annealing was performed in an atmosphere in which Fe is reduced andonly Si and Cr are selectively oxidized. The oxidation potential was controlled through the partial pressure ratio of hydrogenand water vapor. The XPS analysis results confirmed that a Si and Cr complex oxide layer formed on the powder surfaceafter the selective oxidation annealing. Afterward, withstanding voltages were analyzed to evaluate the insulation property. Then, the withstanding voltage of the powder applying the selective oxidation annealing increased significantly comparedto that of the initial powder. Further analysis showed that the powder annealed in an air atmosphere had a significantly lowersaturation magnetic flux density than the initial powder, while the powder applying the selective oxidation annealing hadonly a slightly reduced saturation magnetic flux density.

유기질비료 시비량에 따른 오미자 묘목의 초기 생육특성에 관한 연구

이경아,박태호,박성용,김도현,오문국,김민수,안태진,이상원,김영국,안영섭,박충범,차선우,송범헌 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1

This study was carried out to have basic and applied informations to find the optimum nitrogen fertilization level for organic cultivation and to investigate early growth characteristics of Schizandra chinensis Baillon. Different application levels of the organic fertilizer were based on the recommended rate of N fertilizer. Five different levels of the organic fertilizer were applied to S. chinensis and early growth responses such as the length of vine, the diameter of vine, the number of leaves, and the number of branches were investigated. Lengths of main and total vines were shown longer at the level of 1.0 time organic fertilizer than those at others. The vine length at early growth was the highest at the level of 1.0 time organic fertilizer among the treatments. Stem diameter was shown thicker level of 1.0 time organic fertilizer than others on August and September, whereas on October it was the thickest in the conventional cultivation. Number of leaf was increased higher at the level of 1.0 and 2.0 times organic fertilizer than that in the compared to conventional. The number of branches was appeared the lowest at the level of 1.0 time organic fertilizer at early growth, however they were increased through progressing their growth stages. They were not significantly difference among the treatments except for the level of 2.0 times organic fertilizer. Based on the research results, the growth of S. chinensis was commonly higher at the level of 1.0 time organic fertilizer compared to other treatments.

서울의 PPNG 발생 빈도(1991-1992)

김재홍,윤기범,박평원,김영진,전경민,김영태,김중환,곽호,구상완,송민석,유옥,지혜구,김동원,문상은,박영립,정승호,성범진,성순제,엄주용,황정열,이기홍,이주협,전태진 대한화학요법학회 1994 대한화학요법학회지 Vol.12 No.1

The prevalence of PPNG among pretreated gonorrhea cases isolated at the STD clinic of Choong-Ku Public Health Center in Seoul has been studied and reported annually since 1981. In 1991, 123 strains of N.gonorrhoeae were isolated, among which 58(47.1%) were PPNG. In 1992, 98 starains of N.gonorrhoeae were isolated, among which 51(52.0%) were PPNG. In all, 109(49.3%) strains were found to be PPNG among 221 strains isolated between 1991-1992. The prevalence of PPNG in Seoul showed increased tendency till 1989, thereafter, it has been stationary or slightly decreasing.

토당귀 종자의 형태적 특성과 발아와 입모율에 대한 저장방법,생장조절제 및 프라이밍 처리 효과

안희정,안복주,·김도현,·안영섭,·김영국,박춘근,이상원,·박충범·차선우,·송범헌, 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.1

This study was conducted to have basic and applied informations to establish the cultivation method and to improve the cultivation techniques of Angelica gigas Nakai through investigating the rates of germination and seedling establishment with treatment of plant growth regulator and seed priming. The germination rates of round shape seed were about 0.3~12% higher than those of parallel shape. The germination rates with different storage durations were increased at the level of 25oC and 4oC with the storage days, while they were clearly higher at -20oC compared to those at 4oC and 25oC without the storage durations. With the results of germination rates with treating of plant growth regulator and seed priming, their rates with the round shape seeds were comparatively higher about 6% than those with parallel shape seed and they were increased with increasing of the storage durations. The germination rates were generally appeared higher with GA3 than did those with seed priming. The highest germination rate was appeared at 50 ppm GA3 of plant growth regulator and at -0.5 MPa PEG6000 of seed priming. The germination rates?ㅤ ?ㅤ of Angelica gigas were different with different temperature, storage durations and the treatments of plant growth regulator and seed priming. These results could be used according to different cultivating conditions.

백반증의 PUVA치료반응에 관한 연구(제1보)

박장규,성열훈,성범진,김영호,이증훈 충남대학교 의과대학 지역사회의학연구소 1990 충남의대잡지 Vol.17 No.2

The authors evaluated response to PUVA therapy in 44 vitiligo petients who did'nt show the spontaneous re-pigmentation. In the responded group to PUVA therapy after systemic administration of 8-methoxy psoralen, average MPD of female patients was 3.4 times higher than males, interestingly. Number of irradiation of UVA was similar between male and female, but total doses of female patients group were about 2 times than males till the first re-pigmented spots were noted. The response to PUVA therapy was quite different according to duration of disease and site of lesion. Therefore, we suppose that it is necessary to consider sex of patient, duration of disease, location of vitiligo before making a plan of PUVA therapy.

콩의 개화기 전후 공급과 수용부위의 생장반응과 수량에 대한 질소의 효과

박재홍,송범헌,이철원,손석용,김홍식,박상일 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

This study was conducted to examine the nitrogen effects on the growth responses, the nodulation, and the distribution of dry weight of plant tissues at major growth stages before and after the flowering stage, and to evaluate the yield components and yields with different nitrogen levels. Hwangkeum cultivar(Glycine max L mereill) was cultivated under five different nitrogen levels, 0, 2, 4, 6, 8, N Kg/10a. Stem length and branching number, which were investigated with different N levels at major growth stages, were rapidly increased for 14days for before and after the flowering stage compared to the other growth stages. They were clearly higher with treatment of 2 and 4 N kg/10a than those of other N treatments. Pod number was slightly increased from the flowering to beginning maturity. It was the highest in the treatment of 2 N Kg/10a. Comparing grain number per pod with different N levels, two grains per pod was much higher in all N treatments except for the treatment of 6 N Kg/10a. Dry weight of shoot(including leaf, stem, and pod) was rapidly increased from the flowering stage to the full seed stage and then gradually increased after the full seed stage, whereas the dry weight of root(including the nodule and root) was rapidly increased until to full pod stage and then linearly decreased from the full pod stage until the beginning maturity stage. Comparing dry weight with different N levels, the dry weight of shoot was the highest in the treatment of 4 N Kg/10a, while it of root was the highest in the treatment of 2N Kg/10a. The dry weight of nodule was the highest, 13.1 Kg/10a, at full pod stage. Comparing the dry weight of nodule with different N levels, it was increased to the application amount of 4 N Kg/10a and then clearly decreased with more application amount of N than 4 Kg/10a. The yield components which were mostly affected to the yield were pod number per plant and grain number per plant. They were 57.5 and 106.1, respectively, with treatment of 4 N Kg/10a, which showed the highest yield, about 266 Kg/10a. Comparing yield index with different N levels to the control, the yields with treatment of 2 and 4 Kg/10a were increased to 21% and 34%, respectively.

상속성과 병행성 통합에서 오는 상속 변칙 분석에 관한 연구

박영옥,송기범,이준 조선대학교 전자정보통신연구소 2001 電子情報通信硏究所論文誌 Vol.4 No.2

The integration of concurrent and object-oriented programming paradigm hae been a goal of researchers for over a decade. The concurrent object-oriented programming languages used for development of various concurrent applications. However, concurrency and inheritance have conflicting characteristics, thereby inhibiting their simultaneous use without heavy breakage of encapsulation. This conflicting phenomenon is known as inheritance anomalies, have been limited in applicability and have not addressed all the issues that synchronization raises. In this paper, we introduce the behavior description equation is introduced for the solution for the conflicting phenomenon between inheritance and object-based concurrency. As a result, we can solve the several inheritance anomalies without redefining object methods. Therefore this paper offers flexible concurrency model with an emphasis on the reuse of both synchronization and function code.

콩의 개화기전후 공급과 수용부위의 무기영양성분함량 및 흡수량에 대한 질소의 효과

박재홍,송범헌,이철원,손석용,김홍식,박상일 忠北大學校 農業科學硏究所 2002 農業科學硏究 Vol.19 No.-

This study was conducted to examine the nitrogen effects on the uptaken amounts and utilization of mineral nutrients between source and sink tissues at major growth stages before and after the flowering stage with different nitrogen levels Hwangkeum cultivar(Glycine max L Mereill) was cultivated under five different mtrogen levels, 0, 2, 4, 6, 8 N kg/10a Comparing contents of total-N with different plant tissues at major growth stages before and after the flowering, total-N contents of leaves was gradually decreased from the flowering to the beginning maturity, while it of pod was continuously increased from the full seed to the beginning maturity Total-N content was higher in the treatment of 4 N Kg/10a that those of others The uptaken amount of N determined with different growth stage was rapidly increased maturity Higher proportion of uptaken N were into the leaves at the full seed stage, and they were transported from the leaves into pod at the beginning maturity stage Comparing major mineral elements of the leaves and the pod with different N leaves, in case of the leaves, the content of Fe, Mn, and Zn was decreased throughout the growth stages, whereas the content of Ca and Mg was decreased from the flowering to the full seed and then it was increased after the full seed stage In case of pod, the content of K, Fe, Mn, Zn, and Na was decreased from the flowering to the beginning maturity, while contest of Mg was increased.

대절토 암반사면의 안정화 검토 및 현장계측 분석

박범준,류권일,고영헌,김팔규 忠南大學校 産業技術硏究所 2003 산업기술연구논문집 Vol.18 No.2

We investigated the stability of rock slope caused by large-scale cutting on construction of rapid-transit railway. Applying anchor method in order to build the up, we analyzed the stability using long-term measurement. Slope stability analysis is established by STABL 5M and DIPS as basic programs. Field measurement is required to prove the stability of rock slope which results from the reinforcement corresponding to slope stability analysis. Thus, we used one ground inclinometer and 8 load-cells for the measurement system.

객체지향 기법을 이용한 다중 스레드 프로그램 기법에 관한 연구

송기범,박영옥,이준 조선대학교 동력자원연구소 1995 動力資源硏究所誌 Vol.17 No.2

The Software which uses object-oriented method has the advantage of extensibility, independence and easy maintenance, but has the disadvantage of decrease of system performance. Object-oriented software provides parallel process of objects, and then to improve of system performance we categorize objects into active and passive ones and then use active one. Therefore we implement active and passive objects with object-oriented language, propose multi threaded programming method using thread library for real time process.